Rockwell Automation 1794-IP4 User Manual

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Important User Information

Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.

The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for example. Since there are many variables and requirements associated with any particular installation, Allen-Bradley does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.

Allen-Bradley publication SGI±1.1, ªSafety Guidelines For The Application, Installation and Maintenance of Solid State Controlº (available from your local Allen-Bradley office) describes some important differences between solid-state equipment and electromechanical devices which should be taken into consideration when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in whole or in part, without written permission of Allen±Bradley Company, Inc.

is prohibited.

Throughout this manual we make notes to alert you to possible injury to people or damage to equipment under specific circumstances.

		ATTENTION: Identifies information about practices or
	!	circumstances that can lead to personal injury or death,
		property damage, or economic loss.

Attention helps you:

•identify a hazard

•avoid the hazard

•recognize the consequences

Important: Identifies information that is especially important for successful application and understanding of the product.

Important: We recommend you frequently backup your application programs on appropriate storage medium to avoid possible data loss.

DeviceNet, DeviceNetManager, and RediSTATION are trademarks of Allen-Bradley Company, Inc. PLC, PLC±2, PLC±3, and PLC±5 are registered trademarks of Allen-Bradley Company, Inc. Windows is a trademark of Microsoft.

Microsoft is a registered trademark of Microsoft

IBM is a registered trademark of International Business Machines, Incorporated.

All other brand and product names are trademarks or registered trademarks of their respective companies.

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Purpose of this Manual

Audience

Vocabulary

This manual shows you how to use your FLEX I/O pulse counter module with Allen-Bradley programmable controllers. The manual helps you install, program and troubleshoot your module.

You must be able to program and operate an Allen-Bradley programmable controller to make efficient use of your FLEX I/O module. In particular, you must know how to program block transfers.

We assume that you know how to do this in this manual. If you do not, refer to the appropriate programming and operations manual before you attempt to program your modules.

In this manual, we refer to:

±the pulse counter module as the ªinput moduleº

±the Programmable Controller as the ªcontrollerº

Manual Organization

This manual is divided into seven chapters. The following chart lists each chapter with its corresponding title and a brief overview of the topics covered in that chapter.

Chapter	Title	Contents

14%04)%5 .& !-$ 2(% %1#0)"%1 /3+1% #.3-2%0 ,.$3+%1 &%!230%1 !-$

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	!-$ ,!'% !"+% !//)-'	(.5 2(% ),!'% )1 ,!//%$ 5(%- 31)-' ! %4)#% %2
	5)2( 2(% %4)#% %2 A$!/2%0	!$!/2%0
6	!+)"0!2)-' .30 3+1% .3-2%0	.5 2. #!+)"0!2% 2(% ,.$3+%
	.$3+%
7	0.3"+%1(..2 .30 3+1% .3-2%0	.5 2. 31% 2(% )-$)#!2.01 2. 20.3"+%1(..2 7.30 ,.$3+%
	.$3+%
Appendix	Title	Contents
A	/%#)&)#!2).-1	/%#)&)#!2).-1 &.0 2(% /3+1% #.3-2%0 ,.$3+%

3"+)#!2).- 48 6 A3'312

P±2	Using This Manual

Conventions	We use these conventions in this manual:
	In this manual, we show:	Like this:
	that there is more information about a topic
	in another chapter in this manual

that there is more information about the

topic in another manual

More

For Additional Information

For additional information on FLEX I/O systems and modules, refer to the following documents:

			Publications
Catalog
Number	Voltage	Description	Installation
				User Manual
			Instructions
1794		1794 FLE I/O Product Data	179452.1
17945ACN	24V dc	ControlNet Adapter	179455.8
17945ACNR	24V dc	Redundant Media ControlNet Adapter	179455.18
17945ACN15	24V dc	ControlNet Adapter	179455.47
17945ACNR15	24V dc	Redundant Media ControlNet Adapter	179455.48
17945ADN	24V dc	DeviceNet Adapter	179455.14	179456.5.5
17945ASB/C	24V dc	Remote I/O Adapter	179455.50	179456.5.9
17945ASB2/B	24V dc	25Slot Remote I/O Adapter	179455.44	179456.5.13
17945APB	24V dc	Profibus Adapter	179455.40	179456.5.6
17945IB8	24V dc	8 Sink Input Module	179455.30
17945OB8	24V dc	8 Source Output Module	179455.31
17945IB16	24V dc	16 Sink Input Module	179455.4
17945OB16	24V dc	16 Source Output Module	179455.3
17945IV16	24V dc	16 Source Input Module	179455.28
17945OV16	24V dc	16 Sink Output Module	179455.29
17945OB8EP	24V dc	8 Electronically Fused Output Module	179455.20
17945IB8S	24V dc	Sensor Input Module	179455.7
17945IB10 OB6	24V dc	10 Input/6 Output Module	179455.24
17945IE8	24V dc	Selectable Analog 8 Input Module	179455.6
17945OE4	24V dc	Selectable Analog 4 Output Module	179455.5	179456.5.2
17945IE4 OE2	24V dc	4 Input/2 Output Analog Module	179455.15
		Table continued on next page

Publication 17945 M016B-EN-P - August 2002

Using This Manual

P±3

Summary

			Publications
Catalog	Voltage	Description
Number			Installation
				User Manual
			Instructions
7949OF4	4V dc	4 Output Isolated Analog Module	79495 37
7949IF4	4V dc	4 Input Isolated Analog Module	79495 38	79496 5 8
7949IF XOF	4V dc	Input Output Isolated Analog Module	79495 39
7949IR8	4V dc	8 RTD Input Analog Module	79495	79496 5 4
7949IT8	4V dc	8 Thermocouple Input Module	79495	79496 5 7
7949IRT8	4V dc	8 Thermocouple RTD Input Module	79495 5	79496 5
7949IJ	4V dc	Frequency Input Module	79495 49	79496 5
7949ID	4V dc	Channel Pulse Counter Module	79495 63	79496 5 5
7949IC 6	48V dc	48V dc 6 Input Module	79495 53
7949OC 6	48V dc	48V dc Output Module	79495 54
7949IA8	V ac	8 Input Module	79495 9
7949OA8	V ac	8 Output Module	79495
7949IA8I	V ac	Isolated 8 Input Module	79495 55
7949OA8I	V ac	Isolated Output Module	79495 56
7949IA 6	V ac	6 Input Module	79495 6
7949OA 6	V ac	6 Output Module	79495 6
7949IM8	V ac dc	8 Input Module	79495 57
7949OM8	V ac dc	8 Output Module	79495 58
7949TB		9wire Terminal Base	79495
7949TB3		39wire Terminal Base
7949TBN		Terminal Base Unit	79495 6
7949TBNF		Fused Terminal Base Unit	79495 7
7949TB3T		Temperature Terminal Base Unit	79495 4
7949TB3S		Spring Clamp Terminal Base Unit	79495 4
7949TB3TS		Spring Clamp Temperature Base Unit	79495 43
7949TB3G		Terminal Base Unit	79495 5
7949TB3GS		Spring Clamp Terminal Base Unit	79495 59
7949CE 9CE3		Extender Cables	79495
7949NM		Mounting Kit	7949 3
7949PS	4V dc	Power Supply	79495 35

This preface gave you information on how to use this manual efficiently. The next chapter introduces you to the frequency module.

Publication 7949UM 6B EN P August

P±4	Using This Manual

Publication 1794 UM016B-EN-P - August 2002

Table of Contents

Overview of the Pulse

Counter Module

How to Install Your Pulse Counter Module

Programming Your Pulse

Counter Module

Chapter 1

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-1
How You Use the
Pulse Counter Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-1
What the Pulse Counter Module Does . . . . . . . . . . . . . . . . . . . . . .	1-3
Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-4
Input Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-4
Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-4
Select Type of Measurement . . . . . . . . . . . . . . . . . . . . . . . .	1-4
Start Period Time Measurement . . . . . . . . . . . . . . . . . . . . . .	1-5
Check if the Measurement is Complete . . . . . . . . . . . . . . . . .	1-5
Select Clock Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-5
Select Number of Periods . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-6
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-6

Chapter 2

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2-1
Before You Install Your Input Module . . . . . . . . . . . . . . . . . . . . . . .	2-1
European Union Directive Compliance . . . . . . . . . . . . . . . . . . . . . .	2-1
EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2-1
Low Voltage Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2-2
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2-2
Wiring the Terminal Base Units (1794=TB3G shown) . . . . . . . .	2-3
Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2-4
Mounting the Terminal Base Unit on a DIN Rail . . . . . . . . . . . . .	2-4
Panel/Wall Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2-6
Mounting the Pulse Counter Module on the Terminal Base Unit . .	2-7
Connecting Wiring for Your Pulse Counter Module . . . . . . . . . . . . .	2-9
Wiring to a 1794=TBN or =TBNF Terminal Base Unit . . . . . . . . . .	2-11
Wiring connections for the 1794-IP4 Pulse Counter Module . . . .	2-12
Example of 16-bit Period Time Measurement and 16-bit Accumulating
Pulse Counter Wiring (4 channels) . . . . . . . . . . . . . . . . . . . .	2-13
Example of 32-bit Period Time Measurement Wiring (4 channels)	2-13
Module Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2-14
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2-14

Chapter 3

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-1
Enter Block Transfer Instructions . . . . . . . . . . . . . . . . . . . . . . . . . .	3-1
PLC=2 Family Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-2
PLC=5 Family Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-2
SLC=5 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-3
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3-8

Publication 1794=UM016B-EN-P - August 2002

ii	Table of Contents

Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter

Chapter 4

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4-1
Configuring Your Pulse Counter Module . . . . . . . . . . . . . . . . . . . . .	4-1
Reading Data From Your Module . . . . . . . . . . . . . . . . . . . . . . . . .	4-2
Mapping Data for the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4-2
Pulse Counter Module (1794:IP4) Image Table Mapping . . . . . . .	4-2
Block Transfer Read Word Assignments for the Pulse Counter Module
(1794:IP4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4-3
Bit/Word Definitions for Block Transfer Read Words for the
Pulse Counter Module . . . . . . . . . . . . . . . . . . . . . . . . . . .	4-3
Block Transfer Write Word Assignments for the Pulse
Counter Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4-4
Bit/Word Definitions for the Block Transfer Write Words for the Pulse
Counter Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4-4
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4-5

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Input, Output and Configuration Files for Analog Modules when used with ControlNet

Chapter 5

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-1
About DeviceNetManager Software . . . . . . . . . . . . . . . . . . . . . . . .	5-1
Polled I/O Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-1
Adapter Input Status Word . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-2
System Throughput . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-3
Mapping Data into the Image Table . . . . . . . . . . . . . . . . . . . . . . . .	5-3
Pulse Counter Module (1794:IP4) Image Table Mapping . . . . . . .	5-3
Block Transfer Read Word Assignments for the Pulse Counter
Module (1794:IP4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-4
Block Transfer Write Word Assignments for the Pulse
Counter Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-4
Bit/Word Definitions for the Pulse Counter Module . . . . . . . . .	5-4
Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-7

Chapter 6

Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-1
About the ControlNet Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-1
Communication Over the FLEX I/O Backplane . . . . . . . . . . . . . . . .	6-1
Scheduled Data:Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-2
Unscheduled Data:Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-2
Module I/O Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-2
I/O Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-3
Adapter Input Status Word . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-3
Safe State Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-4
Device Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-4
Communication Fault Behavior . . . . . . . . . . . . . . . . . . . . . . . . .	6-5
Idle State Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-5
Input Data Behavior upon Module Removal . . . . . . . . . . . . . . . .	6-5

Publication 1794:UM016B-EN-P - August 2002

Table of Contents

iii

Troubleshoot the Pulse

Counter Module

Specifications

Pulse Counter Module (17941 P4) mage Table Mapping . . . . . . .	6-6
Bit/Word Definitions for Block Transfer Read Words for the
Pulse Counter Module . . . . . . . . . . . . . . . . . . . . . . . . . . .	6-6

Chapter 7

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7-1
Status ndicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7-1
What's Next . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7-1

Chapter 8

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A-1

Publication 17941UM016B-EN-P - August 2002

iv	Table of Contents

Publication 1794 UM016B-EN-P - August 2002

t

Overview of the P lse Co nter

Mod le

What This Chapter

Contains

How You Use the

Pulse Counter Module

Read this chapter to familiarize yourself with the 1794±IP4 module.

For information on	See page
How You Use the Pulse Counter Module . .	1-1
What the Pulse Counter Module Does . . . .	1-3
Input Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-4

The 1794±IP4 module is an intelligent I/O module designed to perform high speed pulse counting. The module provides:

• 4 pulse transmitter interfaces, each with 2 optocoupled inputs

Each input has + and ± inputs for connection to transmitters with complementary and noncomplementary signals.

The pulse inputs can accept frequencies up to 100KHz. The module accepts and returns binary data.

The module's primary use is accurate, high-speed counting of pulses from flow meters or density meters. This includes quantity counting and speed calculations.

The module has 2 16±bit up/down counters per channel. Each of the 4 interfaces can be individually configured for:

•period time measurement using one 16±bit counter and accumulating pulse counting using the other 16±bit counter.

•period time measurement using a 32±bit counter.

An internal clock (1 or 10MHz) is used for period time measurement.

The number of periods of the input signal to be measured is selectable (1, 2, 4, 8, 16, 32, 64 and 128 periods).

The Pulse Counter has 4 identical pulse transmitter interfaces (12±24V dc), each with 2 signal inputs (N and D). Each input has + and ± connections to the pulse transmitter.

Publication 1794*UM016B-EN-P - August 2002

1±2	Overview of the Pulse Counter Module

	ontrol Word
				ptocouplers
	16 bit ounter	+		+
			ogic
				+
	16 bit ounter

					+
		16 bit ounter
				ogic
usSerial	nterfaceus
		16 bit ounter			+
		16 bit ounter	+		+
				ogic
					+
		16 bit ounter

16 bit ounter			+
		ogic
			+
16 bit ounter
		Gavanically solated	12-24V dc
	Internal +5V dc		0V
		dc/dc onverter

Configuration is selected by setting A (below) in the appropriate position (variable SelectMeasureType). The arrows show signals (control words and registers) controlled by the control system.

	Gate ontrol	&	16 bit ounter	16 bit ounter
	1 128 periods

A

lock

1 z

10 z

ublication 17 41U 016 August 2002

Overview of the Pulse Counter Module

1±3

What the Pulse Counter

Module Does

The Pulse Counter module performs high-speed scaling calculation operations for various industrial applications. The module interfaces with a FLEX I/O family adapter which then communicates with a programmable controller processor that has block-transfer capability and external I/O devices.

The adapter/power supply transfers data to the module (block transfer write) and from the module (block transfer read) using BTW and BTR instructions in your ladder diagram program. These instructions let the adapter read input values and status from the module, and let you write output values and configure the module's mode of operation. The following illustration describes the communication process.

1

2

The adapter transfers your configuration data to the module using a BTW.

External devices transmit frequency signals to the mod= ule.

Allen Bradley

	ADAPTER						LOCAL				24VDC
											POWER SUPPLY
	ACTIVE				FAULT		FAULT
											RIO ADAPTER
											1794=ASB

Flexbus

4

Your ladder program instructs the adapter to perform a BTR of the values and stores them in a data table.

5

	Allen Bradley	1794-IP4
	4 CH Pulse Counter Module
		1
		OK
		3

The adapter and module determine that the transfer was made without error and input values are within speci= fied range.

6

Your ladder program can use and/or move the data (if valid) before it is written over by the transfer of new data in a subsequent transfer.

7

Your ladder program performs BTWs to the module when you power it up, and any time you wish to reconfigure the module.

The module converts frequency signals into integer format and stores these values until the adapter requests their transfer.

Publication 1794=UM016B-EN-P - August 2002

1±4	Overview of the Pulse Counter Module

Typical Applications

Input Capabilities

You can use the 1794±IP4 module in the power management, automotive, food and beverage, and oil and gas industries for various flow and/or turbine metering applications. Some sample applications include:

•quantity counting

•speed calulations

•brewery flow monitoring

•petrochemical flow and custody transfer

The Pulse Counter module has 4 identical input interfaces. Each of the input channels may accept + and ± input signals:

•N+ and N±

•D+ and D±

The pulse inputs can accept frequencies up to 100KHz. The module accepts and returns binary data.

Each of the 4 counters has two 16±bit counter registers.

Variables

Communication between the Pulse Counter module and the control system take place using variables accessible in the control system program. Examples of variables are:

•selection of clock frequency (ClockFrequency)

•selection of measurement type (SelectMeasureType).

Control words are used to set parameters for configuration. Control words sent to the Pulse Counter module are read back to the control system to verify that at least 1 I/O scan has been performed since the control system cycle which initiated the frequency module command.

Select Type of Measurement

The module can be configured for 2 alternate functions using the variable SelectMeasureType. Each of the 4 inputs can be individually configured.

SelectMeasureType Function

0Period time measurement using a 16-bit counter register and the function of a 16-bit accumulating counter

1Period time measurement using a 32-bit counter register

Publication 1794#UM016B-EN-P - August 2002

Overview of the Pulse Counter Module

1±5

Start Period Time Measurement

The control bit StartMeasurement starts the measurement of the time period.

StartMeasurement Function

0Period time measurement stopped (not enabled)

1Period time measurement starts on the positive edge of the variable

Check if the Measurement is Complete

After a complete measurement the flag MeasurementReady is set.

MeasurementReady Function

0The measurement is not complete

1The positive edge of the flag indicates that the measurement is complete

MeasurementReady is reset by the module when a positive edge of

StartMeasurement is received.

Select Clock Frequency

The clock period for the period time measurement resolution selection can be set to 1 or 10MHz using the variable ClockFrequency. 10MHz clock frequency is recommended at 32±bit period time measurement to provide the best accuracy and resolution. Use 1mHz clock frequency at 16±bit frequencies to avoid overflow in the counter at frequencies over 15Hz.

ClockFrequency Function

0lock frequency = 10MHz

1lock frequency = 1MHz

Publication 1794.UM016 -EN-P - August 2002

1±6	Overview of the Pulse Counter Module

Chapter Summary

Select Number of Periods

The number of periods to be measured can be selected using the variable NumberofPeriods.

NumberofPeriods Function

0Measure during 1 period

1Measure during 2 period

2Measure during 4 period

3Measure during 8 period

4Measure during 16 period

5Measure during 32 period

6Measure during 64 period

7Measure during 128 period

In this chapter, you learned about the Pulse Counter module, block transfer communication, and details of how the module functions. Now you can install the module.

2

Install the

IP4 Module

Publication 17 4%UM016 -EN-P - August 2002

t 2

How to Install Yo r P lse Co nter Mod le

What This Chapter

Contains

Before You Install Your

Input Module

In this chapter, we tell you about:

For information on		See page
Before You nstall Your odule
European Union Directives
Power Requirements
nstalling the odule		4
on a D rail		4
on a wall panel		6
on the terminal base		7
Connecting Wiring		9
odule ndicators		5

Before installing your Pulse Counter module in the FLEX I/O system:

	You need to:	As described under:
	Calculate the power requirements of all	Power Requirements page 5
	modules in each F EX system
	Position the keyswitch on the terminal base	nstalling the odule page 4

ATTENTION: The Pulse Counter module does not receive power from the backplane. +24V dc power

! must be applied to your module before installation. If power is not applied, the module position will appear to the adapter as an empty slot in your chassis.

European Union Directive

Compliance

If this product has the CE mark it is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

This product is tested to meet Council Directive 89/336/EEC Electromagnetic Compatibility (EMC) and the following standards, in whole or in part, documented in a technical construction file:

•EN 50081-2EMC ± Generic Emission Standard, Part 2 ± Industrial Environment

•EN 50082-2EMC ± Generic Immunity Standard, Part 2 ± Industrial Environment

This product is intended for use in an industrial environment.

Publication 7945U 6B E P August

2±2	How to Install Your Pulse Counter Module

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC

Low Voltage, by applying the safety requirements of EN 61131±2

Programmable Controllers, Part 2 ± Equipment Requirements and

Tests.

For specific information required by EN 61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications:

•Industrial Automation Wiring and Grounding Guidelines For Noise Immunity, publication 1770-4.1

•Guidelines for Handling Lithium Batteries, publication AG-5.4

•Automation Systems Catalog, publication B111

Power Requirements

This equipment is classified as open equipment and must be mounted in an enclosure during operation to provide safety protection.

The wiring of the terminal base unit is determined by the current draw through the terminal base. Make certain that the current draw does not exceed 10A.

		ATTENTION: Total current draw through the
	!	terminal base unit is limited to 10A. Separate power
		connections may be necessary.

Publication 1794 UM016B-EN-P - August 2002

How to Install Your Pulse Counter Module

2±3

Methods of wiring the terminal base units are shown in the illustration below.

Wiring the Terminal Base Units (1794-TB3G shown)

ATTENTION: Do not daisy chain power or

!ground from the terminal base unit to any ac or dc digital module terminal base unit.

Daisy-chaining

Pulse Counter

Pulse Counter

TC/RTD/mV

Pulse Counter

Module

Module

Module

Module

24V dc	Note: All modules must be pulse, frequency or TC/RTD/mV modules for this configuration.
	Wiring when total current draw is less than 10A

Individual

Digital Input

Pulse Counter

Digital Input

Digital Output

Module

Module

Module

Module

24V dc

24V dc

	24V dc				Note: Use this configuration if using any
					•noisy" dc digital I/O modules in your system.
		Pulse Counter Module wiring separate from digital wiring.
			Wiring when total current draw is greater than 10A
Combination

Pulse Counter			Pulse Counter			TC/RTD/mV
Module				Module		Module

Pulse Counter

Module

24V dc

24V dc

Note: All modules powered by the same power supply

must be pulse, frequency or TC/RTD/mV modules for this configuration.

Total current draw through any base unit must not be greater than 10A

Publication 17942UM016B-EN-P - August 2002

2±4	How to Install Your Pulse Counter Module

Installing the Module

Installation of the Pulse Counter module consists of:

•mounting the terminal base unit

•installing the module into the terminal base unit

•installing the connecting wiring to the terminal base unit

If you are installing your module into a terminal base unit that is already installed, proceed to ªMounting the Pulse Counter Module on the Terminal Baseº on page 2±7.

Mounting the Terminal Base Unit on a DIN Rail

ATTENTION: Do not remove or replace a terminal base unit when power is applied. Interruption of the

! flexbus can result in unintended operation or machine motion.

1. Remove the cover plug (if used) in the male connector of the unit to which you are connecting this terminal base unit.

2. Check to make sure that the 16 pins in the male connector on the adjacent device are straight and in line so that the mating female connector on this terminal base unit will mate correctly.

3. Position the terminal base on the 35 x 7.5mm DIN rail A (A-B pt. no. 199-DR1; 46277-3). Proceed as follows:

C A

B

A

Position terminal base at a slight angle and hooked over the top of the DIN rail.

4.Make certain that the female flexbus connector C is fully retracted into the base unit.

Publication 1794(UM016B-EN-P - August 2002

How to Install Your Pulse Counter Module

2±5

Slide the terminal base unit over tight against the adapter

Make sure the hook on the terminal base slides under the edge of the adapter and the flexbus connector is fully retracted

Press down on the terminal base unit to lock the terminal base on the DIN rail If the terminal base does not lock into place use a screwdriver or similar device to open the locking tab press down on the terminal

base until flush with the DIN rail and release the locking tab to lock the 30077±M base in place

Gently push the flexbus connector into the side

of the adapter to complete the backplane connection

2002

2±6	How to Install Your Pulse Counter Module

1794 NM1 Mounting Kit

Contents:

1 - Mounting late for Adapter

2 - 18 #6 self/tapping screws (2 for the adapter, and 2 each for up to 8 modules)

Adapter Module (not included)

5. Repeat the above steps to install the next terminal base.

Panel/Wall Mounting

Installation on a wall or panel consists of:

•laying out the drilling points on the wall or panel

•drilling the pilot holes for the mounting screws

•mounting the adapter mounting plate

•installing the terminal base units and securing them to the wall or panel

If you are installing your module into a terminal base unit that is already installed, proceed to ªMounting the Pulse Counter Module on the Terminal Baseº on page2±7.

Use the mounting kit Cat. No. 1794-NM1 for panel/wall mounting.

1.4

(35.5)

1

2

Terminal Base Unit

(not included)

To install the mounting plate on a wall or panel:

1.Lay out the required points on the wall/panel as shown in the drilling dimension drawing.

ublication 1794/UM016B-EN- - August 2002